package chapter05;

public class java04_Object_String1 {
    public static void main(String[] args) {
        // TODO 常见类和对象
        // 字符串
        // StringBuilder: 构建字符串
        StringBuilder s = new StringBuilder();
        for ( int i = 0; i < 100; i++) {
            s.append(i);
        }
        System.out.println(s.toString());
        s.length();
        s.reverse();
        s.insert(1,"d");


    }
}
